newbie cant upd8 plesk

[kwakk-steve]

hello
just recently got linux server wityh plesk reloaded 7.5.1
trying to update using updater within plesk.
keep getting error:


Preparing for packages installation...
----- begin of output -----
Installing php-pgsql-4.3.2-18.ent.i386.rpm
warning: /root/psa/PSA_7.5.3/RHel3_std.updates/php-pgsql-4.3.2-18.ent.i386.rpm: V3 DSA signature: NOKEY, key ID 897da07a
error: Failed dependencies:
php = 4.3.2-18.ent is needed by php-pgsql-4.3.2-18.ent

----- end of output -----
===> Autoinstaller: stopped logging at Thu Jul 28 11:52:21 2005


whats to do?
please
tia
kwakk